Arm workout

I'm starting to get in to weight lifting mostly because it's embarrassing anytime I have to exhibit my lack of arm strength, especially my triceps. I'm hoping that if I keep working I may have some nicely toned arms by the end of the summer. Here's what my workout has been, right now it's focused on building strength endurance, which means lighter weight and higher reps.
The first 3 are my letter sets. basically picture the letter in you mind and you raise the weight in that shape. it's not hard and you can find other letters that work for you. I don't suggest something crazy like G or B. non curvy letters are acceptable. :)
V's 3 sets of 10-12 reps
I's  3 sets of 8 reps
T's 3 sets of 10
start with 5 lbs you don't want to go heavier than 10 lbs if you're like me. Remember the contracting muscle, your deltoids, are fairly small so be nice to them. To make this more of a workout go at a 1-3-3 tempo, in other words lift in one second-  hold for 3- and lower slowly in 3.
alternating arm curls 3 sets of 12 reps find a comfortable weight
bench press machine 3 sets of 10
rows 2 sets of 15 on each side

Preparation

Kneel over side of bench by placing knee and hand of supporting arm on bench. Position foot of opposite leg slightly back to side. Grasp dumbbell from floor.

Execution

Pull dumbbell to up to side until it makes contact with ribs or until upper arm is just beyond horizontal. Return until arm is extended and shoulder is stretched downward. Repeat and continue with opposite arm.

http://www.exrx.net/WeightExercises/BackGeneral/DBBentOverRow.html

triceps extensions- 3 sets of 8 

Step 1

Starting Position: Stand in a split-stance position holding a dumbbell with both hands wrapped around the dumbbell handle. Brace your torso by contracting your abdominal/core muscles. Pull your shoulder blades down and back. Your head and neck should be aligned with your spine.
Maintain these engagements throughout the exercise.

Step 2

Upward Phase: Exhale. Slowly press the dumbbell overhead. Straighten your elbows until your arms are vertical to the floor. You elbows are pointing forward and are straight but not locked. The dumbbell should be positioned directly over your head with your palms facing upwards and the dumbbell hanging vertically from your palms. Maintain your balance. Do not change the position of your head, torso, upper arms, wrists or feet.

Step 3

Downward Phase: Inhale. Bend your elbows in a slow and controlled manner, lowering the dumbbell behind your head. Do not allow the upper arms to move. Continue to bend the elbows to a 90 degree bend or until your upper arms begin to move backward. Do not make contact with the back of your head. Do not change the position of your head, torso, upper arms, wrists or feet. Slowly straighten the elbows and return to start position. Repeat.

Attempt to keep your upper arms vertical to the floor throughout the exercise and your elbows shoulder-width apart.

http://www.acefitness.org/exerciselibrary/exercises.aspx?bodypart=2

I do this 2-3 times a week and I can already see a difference in my arms. I'd say I've been at this for about 3 weeks. Happy exercising!